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  1. The "Not Sign (¬)" Symbol in Mathematics

  2. 55 Synonyms & Antonyms for NOT A SIGN OF - Thesaurus.com

  3. ¬ | Not Symbol (Meaning, How To Type on Keyboard, & More)

  4. List of logic symbols - Wikipedia

  5. What is the origin of != in the meaning "not equal to"?

  6. there is no sign of somebody/something | meaning of there is no sign

  7. negation - Should it be "no sign of" or "no signs of"? - English ...

  8. Matthew 12:39: Why "there shall no sign, but the sign of the …

  9. Definition of 'no sign of someone' - Collins Online Dictionary

  10. 'Not-Sign' | Symbol and Codes - Cyber Definitions